Intro to Austenite 上濟充通大学 HAI JIAO TONG UNIV Properties: Stabilizable to produce Austenitic Steel FCC>low hardness and yield strength Fcc→good formability ©Fcc→most closely packed→Smallest specific volume Small self-diffusion coefficient of Fe>high-temperature application Paramagnetic>non-magnetic steel Large liner expansion coefficient ● Poor thermal conductivity>heating/cooling rate? O TONG UN K.Chen Fe-C phase diagram can be modified by alloying element additions> austenite phase field increases so much that y phase stable at room temperature. In fcc,existence of many slip systems leads to easy dislocation movement. At high heating/cooling rate,large temperature gradient along with large liner expansion coefficient will result in huge thermal stressing inside of workpiece. 10- Fe-C phase diagram can be modified by alloying element additions  austenite phase field increases so much that γ phase stable at room temperature. - In fcc, existence of many slip systems leads to easy dislocation movement. - At high heating/cooling rate, large temperature gradient along with large liner expansion coefficient will result in huge thermal stressing inside of workpiece. 10